I had the most amazing tour. Linda was informative, professional and she answered all my questions with extensive knowledge. She understood immediately that I was interested in the social aspects of the neighborhood and she added many stories. She was born in Chinatown and she lived there in her younger years. We also had an incredible dim sum and I really recommend to take the lunch (she joins and has many stories)
Bottom line, a must in your visit to San Francisco, don't go to Chinatown by yourself. You need a tour and she is the best.